GSK 6K Director/pdmr Shareholding

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of February 2021

Commission File Number 001-15170

GlaxoSmithKline plc

(Translation of registrant's name into English)

980 Great West Road, Brentford, Middlesex, TW8 9GS

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F . . . .X. . . . Form 40-F . . . . . . . .

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ____

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ____

GlaxoSmithKline plc (the 'Company')

Transaction notification

1.	Details of PDMR/person closely associated with them ('PCA')
a)	Name	Dr H Barron
b)	Position/status	Chief Scientific Officer and President, R&D
c)	Initial notification/ amendment	Initial notification
2.	Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor
a)	Name	GlaxoSmithKline plc
b)	LEI	5493000HZTVUYLO1D793
3.	Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transaction(s) has been conducted
a)	Description of the financial instrument	American Depositary Shares ('ADSs') ISIN: US37733W1053
b)	Nature of the transaction	The sale of ADSs to meet tax liabilities for the vesting of awards granted in 2018 under the Company's 2017 Performance Share Plan.
c)	Price(s) and volume(s)		Price(s)	Volume(s)
			$35.6978	86,855

d)	Aggregated information	N/A (single transaction)
	Aggregated volume Price
e)	Date of the transaction	2021-02-12
f)	Place of the transaction	New York Stock Exchange (XNYS)

1.	Details of PDMR/person closely associated with them ('PCA')
a)	Name	Mr R Connor
b)	Position/status	President, Global Vaccines
c)	Initial notification/ amendment	Initial notification
2.	Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor
a)	Name	GlaxoSmithKline plc
b)	LEI	5493000HZTVUYLO1D793
3.	Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transaction(s) has been conducted
a)	Description of the financial instrument	Ordinary shares of 25 pence each ('Ordinary Shares') ISIN: GB0009252882
b)	Nature of the transaction	The sale of Ordinary Shares to meet tax liabilities for the vesting of awards granted in 2018 under the Company's 2017 Performance Share Plan.
c)	Price(s) and volume(s)		Price(s)	Volume(s)
			£12.6107	63,501

d)	Aggregated information	N/A (single transaction)
	Aggregated volume Price
e)	Date of the transaction	2021-02-12
f)	Place of the transaction	London Stock Exchange (XLON)

1.	Details of PDMR/person closely associated with them ('PCA')
a)	Name	Ms D Conrad
b)	Position/status	SVP, Human Resources
c)	Initial notification/ amendment	Initial notification
2.	Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor
a)	Name	GlaxoSmithKline plc
b)	LEI	5493000HZTVUYLO1D793
3.	Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transaction(s) has been conducted
a)	Description of the financial instrument	Ordinary shares of 25 pence each ('Ordinary Shares') ISIN: GB0009252882
b)	Nature of the transaction	Following the vesting of Ordinary Shares awarded in 2018 under the Company's Performance Share Plan, Ms Conrad received a cash amount of £115,778.84 (less applicable tax withholding) which is equal to the market value of the number of Ordinary Shares which would otherwise have been transferred to her.
c)	Price(s) and volume(s)		Price(s)	Volume(s)
			£12.6107	9,181

d)	Aggregated information	N/A (single transaction)
	Aggregated volume Price
e)	Date of the transaction	2021-02-15
f)	Place of the transaction	N/A

1.	Details of PDMR/person closely associated with them ('PCA')
a)	Name	Mr J Ford
b)	Position/status	SVP & General Counsel
c)	Initial notification/ amendment	Initial notification
2.	Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor
a)	Name	GlaxoSmithKline plc
b)	LEI	5493000HZTVUYLO1D793
3.	Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transaction(s) has been conducted
a)	Description of the financial instrument	American Depositary Shares ('ADSs') ISIN: US37733W1053
b)	Nature of the transaction	The sale of ADSs to meet tax liabilities for the vesting of awards granted in 2018 under the Company's 2017 Performance Share Plan.
c)	Price(s) and volume(s)		Price(s)	Volume(s)
			$35.6978	2,458

d)	Aggregated information	N/A (single transaction)
	Aggregated volume Price
e)	Date of the transaction	2021-02-12
f)	Place of the transaction	New York Stock Exchange (XNYS)

1.	Details of PDMR/person closely associated with them ('PCA')
a)	Name	Mr N Hirons
b)	Position/status	SVP, Global Ethics and Compliance
c)	Initial notification/ amendment	Initial notification
2.	Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor
a)	Name	GlaxoSmithKline plc
b)	LEI	5493000HZTVUYLO1D793
3.	Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transaction(s) has been conducted
a)	Description of the financial instrument	Ordinary shares of 25 pence each ('Ordinary Shares') ISIN: GB0009252882
b)	Nature of the transaction	The sale of Ordinary Shares to meet tax liabilities for the vesting of awards granted in 2018 under the Company's 2017 Performance Share Plan.
c)	Price(s) and volume(s)		Price(s)	Volume(s)
			£12.6107	23,551

d)	Aggregated information	N/A (single transaction)
	Aggregated volume Price
e)	Date of the transaction	2021-02-12
f)	Place of the transaction	London Stock Exchange (XLON)

1.	Details of PDMR/person closely associated with them ('PCA')
a)	Name	Ms S Jackson
b)	Position/status	SVP, Global Communications & CEO Office
c)	Initial notification/ amendment	Initial notification
2.	Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor
a)	Name	GlaxoSmithKline plc
b)	LEI	5493000HZTVUYLO1D793
3.	Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transaction(s) has been conducted
a)	Description of the financial instrument	Ordinary shares of 25 pence each ('Ordinary Shares') ISIN: GB0009252882
b)	Nature of the transaction	The sale of Ordinary Shares to meet tax liabilities for the vesting of awards granted in 2018 under the Company's 2017 Performance Share Plan.
c)	Price(s) and volume(s)		Price(s)	Volume(s)
			£12.6107	4,316

d)	Aggregated information	N/A (single transaction)
	Aggregated volume Price
e)	Date of the transaction	2021-02-12
f)	Place of the transaction	London Stock Exchange (XLON)

1.	Details of PDMR/person closely associated with them ('PCA')
a)	Name	Mr D Jackson
b)	Position/status	PCA of Ms S Jackson (SVP, Global Communications & CEO Office)
c)	Initial notification/ amendment	Initial notification
2.	Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor
a)	Name	GlaxoSmithKline plc
b)	LEI	5493000HZTVUYLO1D793
3.	Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transaction(s) has been conducted
a)	Description of the financial instrument	Ordinary shares of 25 pence each ('Ordinary Shares') ISIN: GB0009252882
b)	Nature of the transaction	The sale of Ordinary Shares to meet tax liabilities for the vesting of awards granted in 2018 under the Company's 2017 Performance Share Plan.
c)	Price(s) and volume(s)		Price(s)	Volume(s)
			£12.6107	2,038

d)	Aggregated information	N/A (single transaction)
	Aggregated volume Price
e)	Date of the transaction	2021-02-12
f)	Place of the transaction	London Stock Exchange (XLON)

1.	Details of PDMR/person closely associated with them ('PCA')
a)	Name	Mr B McNamara
b)	Position/status	CEO, GSK Consumer Healthcare
c)	Initial notification/ amendment	Initial notification
2.	Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor
a)	Name	GlaxoSmithKline plc
b)	LEI	5493000HZTVUYLO1D793
3.	Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transaction(s) has been conducted
a)	Description of the financial instrument	American Depositary Shares ('ADSs') ISIN: US37733W1053
b)	Nature of the transaction	The sale of ADSs to meet tax liabilities for the vesting of awards granted in 2018 under the Company's 2017 Performance Share Plan.
c)	Price(s) and volume(s)		Price(s)	Volume(s)
			$35.6978	43,024

d)	Aggregated information	N/A (single transaction)
	Aggregated volume Price
e)	Date of the transaction	2021-02-12
f)	Place of the transaction	New York Stock Exchange (XNYS)

1.	Details of PDMR/person closely associated with them ('PCA')
a)	Name	Mr L Miels
b)	Position/status	President, Global Pharmaceuticals
c)	Initial notification/ amendment	Initial notification
2.	Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor
a)	Name	GlaxoSmithKline plc
b)	LEI	5493000HZTVUYLO1D793
3.	Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transaction(s) has been conducted
a)	Description of the financial instrument	Ordinary shares of 25 pence each ('Ordinary Shares') ISIN: GB0009252882
b)	Nature of the transaction	The sale of Ordinary Shares to meet tax liabilities for the vesting of awards granted in 2018 under the Company's 2017 Performance Share Plan.
c)	Price(s) and volume(s)		Price(s)	Volume(s)
			£12.6107	29,048

d)	Aggregated information	N/A (single transaction)
	Aggregated volume Price
e)	Date of the transaction	2021-02-12
f)	Place of the transaction	London Stock Exchange (XLON)

1.	Details of PDMR/person closely associated with them ('PCA')
a)	Name	Mr D Redfern
b)	Position/status	Chief Strategy Officer
c)	Initial notification/ amendment	Initial notification
2.	Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor
a)	Name	GlaxoSmithKline plc
b)	LEI	5493000HZTVUYLO1D793
3.	Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transaction(s) has been conducted
a)	Description of the financial instrument	Ordinary shares of 25 pence each ('Ordinary Shares') ISIN: GB0009252882
b)	Nature of the transaction	The sale of Ordinary Shares to meet tax liabilities for the vesting of awards granted in 2018 under the Company's 2017 Performance Share Plan.
c)	Price(s) and volume(s)		Price(s)	Volume(s)
			£12.6107	43,533

d)	Aggregated information	N/A (single transaction)
	Aggregated volume Price
e)	Date of the transaction	2021-02-12
f)	Place of the transaction	London Stock Exchange (XLON)

1.	Details of PDMR/person closely associated with them ('PCA')
a)	Name	Mr R Simard
b)	Position/status	President, Pharmaceuticals Supply Chain
c)	Initial notification/ amendment	Initial notification
2.	Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor
a)	Name	GlaxoSmithKline plc
b)	LEI	5493000HZTVUYLO1D793
3.	Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transaction(s) has been conducted
a)	Description of the financial instrument	Ordinary shares of 25 pence each ('Ordinary Shares') ISIN: GB0009252882
b)	Nature of the transaction	The sale of Ordinary Shares to meet tax liabilities for the vesting of awards granted in 2018 under the Company's 2017 Performance Share Plan.
c)	Price(s) and volume(s)		Price(s)	Volume(s)
			£12.6107	4,316

d)	Aggregated information	N/A (single transaction)
	Aggregated volume Price
e)	Date of the transaction	2021-02-12
f)	Place of the transaction	London Stock Exchange (XLON)

1.	Details of PDMR/person closely associated with them ('PCA')
a)	Name	Ms K Terrell
b)	Position/status	Chief Digital & Technology Officer
c)	Initial notification/ amendment	Initial notification
2.	Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor
a)	Name	GlaxoSmithKline plc
b)	LEI	5493000HZTVUYLO1D793
3.	Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transaction(s) has been conducted
a)	Description of the financial instrument	American Depositary Shares ('ADSs') ISIN: US37733W1053
b)	Nature of the transaction	The sale of ADSs to meet tax liabilities for the vesting of awards granted in 2018 under the Company's 2017 Performance Share Plan.
c)	Price(s) and volume(s)		Price(s)	Volume(s)
			$35.6978	27,459

d)	Aggregated information	N/A (single transaction)
	Aggregated volume Price
e)	Date of the transaction	2021-02-12
f)	Place of the transaction	New York Stock Exchange (XNYS)

1.	Details of PDMR/person closely associated with them ('PCA')
a)	Name	Mr P Thomson
b)	Position/status	President, Global Affairs
c)	Initial notification/ amendment	Initial notification
2.	Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor
a)	Name	GlaxoSmithKline plc
b)	LEI	5493000HZTVUYLO1D793
3.	Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transaction(s) has been conducted
a)	Description of the financial instrument	Ordinary shares of 25 pence each ('Ordinary Shares') ISIN: GB0009252882
b)	Nature of the transaction	The sale of Ordinary Shares to meet tax liabilities for the vesting of awards granted in 2018 under the Company's 2017 Performance Share Plan.
c)	Price(s) and volume(s)		Price(s)	Volume(s)
			£12.6107	31,041

d)	Aggregated information	N/A (single transaction)
	Aggregated volume Price
e)	Date of the transaction	2021-02-12
f)	Place of the transaction	London Stock Exchange (XLON)

1.	Details of PDMR/person closely associated with them ('PCA')
a)	Name	Ms D Waterhouse
b)	Position/status	CEO of ViiV Healthcare
c)	Initial notification/ amendment	Initial notification
2.	Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor
a)	Name	GlaxoSmithKline plc
b)	LEI	5493000HZTVUYLO1D793
3.	Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transaction(s) has been conducted
a)	Description of the financial instrument	Ordinary shares of 25 pence each ('Ordinary Shares') ISIN: GB0009252882
b)	Nature of the transaction	The sale of Ordinary Shares to meet tax liabilities for the vesting of awards granted in 2018 under the Company's 2017 Performance Share Plan.
c)	Price(s) and volume(s)		Price(s)	Volume(s)
			£12.6107	5,917

d)	Aggregated information	N/A (single transaction)
	Aggregated volume Price
e)	Date of the transaction	2021-02-12
f)	Place of the transaction	London Stock Exchange (XLON)

1.	Details of PDMR/person closely associated with them ('PCA')
a)	Name	Ms V Whyte
b)	Position/status	Company Secretary
c)	Initial notification/ amendment	Initial notification
2.	Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor
a)	Name	GlaxoSmithKline plc
b)	LEI	5493000HZTVUYLO1D793
3.	Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transaction(s) has been conducted
a)	Description of the financial instrument	Ordinary shares of 25 pence each ('Ordinary Shares') ISIN: GB0009252882
b)	Nature of the transaction	The sale of Ordinary Shares to meet tax liabilities for the vesting of awards granted in 2018 under the Company's 2017 Performance Share Plan.
c)	Price(s) and volume(s)		Price(s)	Volume(s)
			£12.6107	4,316

d)	Aggregated information	N/A (single transaction)
	Aggregated volume Price
e)	Date of the transaction	2021-02-12
f)	Place of the transaction	London Stock Exchange (XLON)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorised.

	GlaxoSmithKline plc
	(Registrant)

Date: February 17, 2021

	By:/s/ VICTORIA WHYTE --------------------------

	Victoria Whyte
	Authorised Signatory for and on
	behalf of GlaxoSmithKline plc

GSK (GSK) 6-KDirector/pdmr Shareholding